diff --git a/.gitattributes b/.gitattributes
index 417b2d7bcdf..21f799c5072 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -502,6 +502,7 @@ icu4j/tools/build/icu4j55.api3.gz -text
 icu4j/tools/build/icu4j56.api3.gz -text
 icu4j/tools/build/icu4j57.api3.gz -text
 icu4j/tools/build/icu4j58.api3.gz -text
+icu4j/tools/build/icu4j59.api3.gz -text
 tools/currency/.classpath -text
 tools/currency/.project -text
 tools/currency/.settings/org.eclipse.core.resources.prefs -text
diff --git a/icu4j/tools/build/icu4j59.api3.gz b/icu4j/tools/build/icu4j59.api3.gz
new file mode 100644
index 00000000000..ff0e13bd9d3
--- /dev/null
+++ b/icu4j/tools/build/icu4j59.api3.gz
@@ -0,0 +1,3 @@
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+size 56274